SainSmart 4-Channel 5V Relay Module for Arduino UNO MEGA R3 Mega2560 Duemilanove Nano Robot

Was very happy with this product out of the box offed me exactly what i needed for my raspberry pi/Arduino project to get my 3d printer power automated. Bit disappointing when i finally installed it and was doing continuity testing that the second relay on the board sticks closed even when showing open but by this stage was too late to return it as it has been assembled into a cabinet. Gave it 3 starts because it has greater functionality that other models i've seen just a shame about the quality control on that second relay.Have updated to 1 star as i have now purchased a second one of these boards an this board only has one relay that worked and the second original board is now down to 2 reliable working relays so of a potential 8 relays i have 3 that work reliably. Completely unacceptable.

A bit overkill for my application as I only needed one relay and the 4 relay version was same day delivery. I used it to switch on and off my 3d printer (ender 3 v2) via octoprint.

Definitely a good quality product.

Excellent Product, good delivery

GOOD PRODUCT, I LOVE IT

Absolutely fantastic bit of kit. So good at what it is designed to do, in fact, that I bought th 8 Channel version a few days later. The suppliers have been brilliant, no problems and prompt delivery. I would definitely recommend.

Nice little bit of kit, works well. Used it to power Xmas lights; ran for 2 weeks non-stop with no problem

well made and solid great if you need to switch higher power loads.